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Spectroscopic study and electronic structure of prototypical iron porphyrins and their mu-oxo-dimer derivatives with different functional configurations
Xu W(徐伟); Xu, W; Dziedzic-Kocurek, K; Yu, M; Wu, Z; Marcelli, A; Yu MJ(于梅娟); Wu ZY(吴自玉)
2014
发表期刊RSC ADVANCES
卷号4期号:87页码:46399-46406
摘要Metalloporphyrins are networking molecules with strong internal N-H hydrogen bonds that may be used to substitute a metal ion inside a porphyrin ring, forming a metallo complex. The understanding of electronic structures and charge dynamics of porphyrin based molecular architectures is mandatory to clarify biological functions, catalytic processes, and opto-electrical responses in which these molecules are involved. We present here a systematic analysis of the electronic structures and the charge dynamics of two different iron-porphyrins (i.e. protoporphyrin IX and meso-tetraphenylporphine) with different functional architectures. We investigated these prototypical porphyrins and their mu-oxo-dimer derivatives by means of Fe K-edge X-ray Absorption Near-Edge Spectroscopy (XANES) combined with theoretical calculations. The electronic structure, namely the partial projected density of states and the polarization components were discussed in terms of orbital hybridizations among metal and local ligands. Data show that hydrogens are electron donors while the central metal irons accept electrons. Moreover, the metal axial ligands exhibit different electron behaviors: donors for Cl in prototypical porphyrins and acceptors for O in mu-oxo-dimer derivatives. Actually, the charge dynamics are affected by local metal ligands, but also strongly depend on the mid-range atomic ordering of the porphyrins network. The charge dynamics, evaluated from the self-consistent local potential, is associated with charge transfer mechanisms involving interactions with the axial ligands as well as with the substituents. The quantum chemical topology analysis of the electron localization function (ELF) has been used to identify the distribution of the electron pairs. They are localized around Cl atoms regardless of porphyrin configurations. Charge dynamics and electron localization are fundamental information for a deep understanding of the role of porphyrin and porphyrin-like molecules in a wide range of molecular biophysical mechanisms and in materials science processes.
学科领域Chemistry
DOI10.1039/c4ra04685d
收录类别SCI
WOS记录号WOS:000342761800001
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被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/225353
专题多学科研究中心
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GB/T 7714
Xu W,Xu, W,Dziedzic-Kocurek, K,et al. Spectroscopic study and electronic structure of prototypical iron porphyrins and their mu-oxo-dimer derivatives with different functional configurations[J]. RSC ADVANCES,2014,4(87):46399-46406.
APA 徐伟.,Xu, W.,Dziedzic-Kocurek, K.,Yu, M.,Wu, Z.,...&吴自玉.(2014).Spectroscopic study and electronic structure of prototypical iron porphyrins and their mu-oxo-dimer derivatives with different functional configurations.RSC ADVANCES,4(87),46399-46406.
MLA 徐伟,et al."Spectroscopic study and electronic structure of prototypical iron porphyrins and their mu-oxo-dimer derivatives with different functional configurations".RSC ADVANCES 4.87(2014):46399-46406.
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